In the Web theme -> Configuration page of the database preferences, a specific IP address can be assigned to your 4D Web Server. By default, the Web server answers on all the IP addresses (All option). However in cases where in another web server is running on a machine with multiple IP address, a specific IP address can be assigned to 4D running as web server. In the above settings,a pop-up menu automatically displays all the IP addresses present on the machine. In order for 4D Web Server to respond to request to a particular IP address, select the specific IP address from the pop-up list.